<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
  <title>Document</title>
  <style>
  * {
    box-sizing: border-box;
  }
  body {
    background: #fff;
  }
  .rainbow {
    height: 200px;
    overflow: hidden;
  }
  .rainbow div {
    overflow: hidden;
  }
  .rainbow>div{
    width: 400px;
    height: 400px;
    background: red;
    border-radius: 50%;
  }
  .rainbow>div>div{
    background: orange;
    height: 380px;
    margin: 10px;
    border-radius: 50%;
  }
  .rainbow>div>div>div{
    background: hsl(60, 80%, 50%);
    height: 360px;
    margin: 10px;
    border-radius: 50%;
  }
  .rainbow>div>div>div>div{
    background: hsl(120, 80%, 50%);
    height: 340px;
    margin: 10px;
    border-radius: 50%;
  }
  .rainbow>div>div>div>div>div{
    background: hsl(180, 50%, 50%);
    height: 320px;
    margin: 10px;
    border-radius: 50%;
  }
  .rainbow>div>div>div>div>div>div{
    background: hsl(240, 80%, 50%);
    height: 300px;
    margin: 10px;
    border-radius: 50%;
  }
  .rainbow>div>div>div>div>div>div>div{
    background: hsl(300, 80%, 50%);
    height: 280px;
    margin: 10px;
    border-radius: 50%;
  }
  .rainbow>div>div>div>div>div>div>div>div{
    background: hsl(360, 80%, 100%);
    height: 260px;
    margin: 10px;
    border-radius: 50%;
  }
  </style>
</head>
<body>
  <div class="rainbow">
    <div>
      <div>
        <div>
          <div>
            <div>
              <div>
                <div>
                  <div></div>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  </div>
</body>
</html>